Proof step

Ore-algebra identity of two definitions

All-n equality of two definitions

Concludes

shift_x_plus_one of shift_x_plus_one of Triangle read by rows of coefficients of Chebyshev's U(n,x) polynomials (exponents in increasing order).

Premises

none: a direct theorem check

Theorem

polytool ?

Checked

polytool replayed · Lean not attempted